All articles starting with U
6,146 articles
Unstoppable (성난황소) (2018 film)
Unstoppable (성난황소, Seongnan Hwangso, literally "Angry Bull") is a 2018 South Korean crime action film directed by Kim Min-ho, in which retired gangster Dong-chul, played by Ma Dong-seok, fights a kidnapper to get his wife back.
Unstructured (company)
Unstructured is a San Francisco company founded in 2022 that converts unstructured enterprise documents such as PDFs and emails into structured data for large language model applications.
Unstructured interview
An unstructured interview is a qualitative research method in which neither questions nor answer categories are predetermined, yielding rich, detailed answers from the participant's point of view.
Unstructured Supplementary Service Data
Unstructured Supplementary Service Data (USSD) is a GSM protocol for real-time text sessions between a handset and an operator's network, used to check balances and run mobile money.
Unsuccessful nominations to the Supreme Court of the United States
Unsuccessful nominations to the Supreme Court of the United States are the 37 presidential nominations since 1789 that failed through Senate rejection, presidential withdrawal, or lapse without Senate action.
Unsuccessful recess appointments to United States federal courts
Unsuccessful recess appointments to US federal courts: temporary Article III judgeships filled under the Recess Appointments Clause that lapsed without Senate confirmation, including Heen, Pickering, and Rutledge, distinct from confirmed appointees Gregory and Pryor.
Unsung Hero (film)
Unsung Hero is a 2024 American faith-based drama film about the Smallbone family, who left Australia for Nashville in the early 1990s; it was co-directed by Joel Smallbone, who plays his own father.
Unsupervised change detection
Unsupervised change detection is a family of image-processing and machine-learning methods that locate differences between two co-registered images taken at different times, without labeled training samples.
Unsupervised learning
Unsupervised learning, also called unsupervised machine learning, is a machine learning paradigm in which models learn patterns from unlabeled data, chiefly through clustering and dimensionality reduction.
Unsupervised representation learning
Unsupervised representation learning trains a model to convert unlabeled data into feature representations useful for later prediction tasks, without task-specific labels; self-supervised learning is its dominant modern form.
Unsuri
Unsuri (عنصری بلخی) was a Persian poet of the early Ghaznavid period who served as poet laureate, or king of poets, to Sultan Mahmud of Ghazna until his death in 1039.
Unsymmetrical dimethylhydrazine
Unsymmetrical dimethylhydrazine (UDMH), also called 1,1-dimethylhydrazine, is a toxic, storable liquid rocket fuel that ignites on contact with nitrogen tetroxide, used in the Proton rocket and Aerozine 50.
Untamed (TV series)
Untamed is a 2025 Netflix six-episode mystery thriller limited series created by Mark L. Smith and Elle Smith, starring Eric Bana as National Park Service ISB agent Kyle Turner. Set in Yosemite but filmed in British Columbia; renewed for a Hawaii-set season 2.
Untamed Heart
Untamed Heart is a 1993 American romantic drama film directed by Tony Bill and starring Christian Slater and Marisa Tomei as Minneapolis diner workers who fall in love.
Untargeted metabolomics
Untargeted metabolomics is an analytical approach that uses mass spectrometry or spectroscopy to detect as many small-molecule metabolites as possible in a sample, without selecting compounds in advance.
Untargeted screening
Untargeted screening is an analytical chemistry approach that detects all components of a sample without a predefined target list, most commonly by full-scan high-resolution mass spectrometry coupled to chromatography.
Untash-Napirisha
Untash-Napirisha was a Middle Elamite king of the Igihalkid dynasty, reigning around 1340-1300 BC, who founded Dur-Untash, modern Chogha Zanbil in Iran, centered on the largest ziggurat of the ancient Near East.
Unteres Murtal / Lower Mura Valley Biosphere Reserve
The Unteres Murtal (Lower Mura Valley) Biosphere Reserve is a UNESCO biosphere reserve in southeastern Styria, Austria, designated in 2019, covering 13,180 hectares along the lower Mura River.
Unterhaching
SpVgg Unterhaching (Spielvereinigung Unterhaching), German sports club founded 1925 in Unterhaching near Munich; football team played Bundesliga 1999-2001, now Regionalliga Bayern, declined 2026 promotion playoffs for financial reasons.
Unterhaltungssoftware Selbstkontrolle
Unterhaltungssoftware Selbstkontrolle (USK), Germany's voluntary games industry self-regulation body founded 1994, age-rates video games under the JuSchG via committees of youth protection experts and rates online games through IARC since 2013.
Unterkirchberg
Unterkirchberg: village in Illerkirchberg, Alb-Donau-Kreis, Baden-Württemberg, first recorded 1148 as Chirchberg. Seat of the Counts of Kirchberg, St. Martin's church of Kloster Wiblingen, and site of the largest Roman auxiliary fort on the upper Danube Limes.
Untermensch
Untermensch (German for "subhuman" or "under-man") was a term of Nazi racial ideology for people deemed biologically inferior to the so-called Aryan race, above all Jews.
Untersberg
The Untersberg is a karst limestone massif of the Berchtesgaden Alps on the Austrian-German border southwest of Salzburg, rising to 1,972 m and supplying most of the city's drinking water.
Unterschwaningen
Unterschwaningen, a municipality in the Ansbach district of Middle Franconia, Bavaria, with districts Oberschwaningen, Dennenlohe, and Kröttenbach; first recorded 1053 as Sweiningen, site of a Roman Limes fort and a margravial summer residence.
Unterweser nuclear power plant
The Unterweser nuclear power plant (Kernkraftwerk Unterweser) was a pressurized water reactor at Kleinensiel on the Weser river in Lower Saxony, Germany, shut down in March 2011 after Fukushima.
Untether AI
Untether AI was a Toronto startup founded in 2018 that made RISC-V-based AI inference chips, shut down in 2025, and went bankrupt after AMD hired its team.
Unthinkable
Unthinkable is a 2010 Gregor Jordan thriller starring Samuel L. Jackson, Carrie-Anne Moss, and Michael Sheen about interrogating a terrorist who planted three nuclear bombs; released direct to disc, later a Netflix hit.
Until August
Until August (En agosto nos vemos) is Gabriel García Márquez's short posthumous novel, published in Spanish and English in March 2024 by his sons against his wishes, about Ana Magdalena Bach's yearly August trips to a Caribbean island.
Until Dawn
Until Dawn: 2015 interactive survival horror by Supermassive Games, PS4 exclusive; eight teens on Blackwood Mountain, butterfly-effect choices, permanent deaths; remade in Unreal Engine 5 by Ballistic Moon for PS5/PC in 2024; 2025 film adaptation.
Until Dawn (film)
Until Dawn is an American horror film directed by David F. Sandberg, released in 2025. It is loosely based on the 2015 PlayStation Studios video game.